Yiwu Shikai Seeks a Declaration That Its Puzzle Boards Do Not Infringe a Jigsaw Puzzle Board Patent.

The complaint

Yiwu Shikai e-commerce Limited Liability Company filed a nine-page complaint in the Northern District of Illinois, Eastern Division, on November 5, 2026, No. 1:26-cv-13726, with a jury demand. It seeks declaratory judgments under 28 U.S.C. 2201 and 2202 that its puzzle boards do not infringe U.S. Patent No. 12,420,174 and that the patent is invalid, and it adds an Illinois tortious interference claim. The complaint describes the defendant as an individual who, on information and belief, is a citizen of China residing in Shenzhen, and says the defendant uses the alias Ritche and is the patent's assignee.

The Amazon complaint

Shikai sells puzzle boards on Amazon. The complaint alleges that the defendant filed complaints with Amazon accusing Shikai's products of infringing the '174 patent. It reproduces the details of one complaint, which list ASINs B0GRHYMW19, B0H3KV23GZ, and B0H3KP7K3H, an infringement type of patent, and the '174 patent number. The complaint says the three ASINs are different sizes of the same product.

The patent

The '174 patent, titled Rotating Device and Jigsaw Puzzle Board, issued September 23, 2025, from Application No. 18/950,536, filed November 18, 2024. It has three independent claims, claims 1, 6, and 15. Claim 1 covers a rotating device with a case and a first roller and a smaller second roller, where the second roller is blocked by the first roller from leaking out of the opening and the case has a dome covering. Claims 6 and 15 cover jigsaw puzzle boards with a kickstand, where the rotating devices are in a non-working state when the kickstand supports the board at an incline.

The noninfringement theory

The complaint says Shikai's board is a large rectangular surface with four rotating wheels and a lever bar on the back, and includes photographs. It alleges that none of the wheels has a dome covering or a second roller blocked by a first roller, and that the wheels keep working whatever the position of the lever bar, so the product does not meet claim 1, claim 6, or claim 15. It alleges, on information and belief, that the defendant inspected the product before complaining to Amazon and knew those facts, and it calls the defendant's Amazon complaints baseless.

The counts and relief

Count I seeks a declaration of noninfringement. Count II seeks a declaration that every claim is invalid under 35 U.S.C. 102, alleging on information and belief that the subject matter of each claim was disclosed in the prior art. Count III alleges tortious interference under Illinois common law, alleging on information and belief that the defendant knew the boards did not meet the claims but filed the Amazon complaints anyway. The complaint asks for those declarations, a finding that the case is exceptional under 35 U.S.C. 285 with attorneys' fees and costs, damages for tortious interference, interest, and an injunction barring the defendant from asserting the patent against the three ASINs.

The early filings

The docket shows only the complaint, entered November 5, 2026. As of November 9, 2026, the USPTO's trial records show no PTAB proceedings on the patent.

What to watch next

Watch for service on the defendant and any answer or infringement counterclaim.